Custom Copperworks have done a couple of projects for me. Up front they did a small copper clad window and in the back they did copper roof over my patio. Before hiring them I have searched far and wide all over California. Most places that claim to be able to do custom copper work actually are either extremely overpriced as they get they copper roof panel fabricated on the East Coast or are clueless.
Anyway for my small window they used individually pressed copper tiles. After they finished they came back to bee wax it. This actually even wasn't in the contract. (I didn't even know that such thing exists) They melted some beeswax in a copper pot and hand applied it to the copper so that the design stands out better. Looks Amazing!!!
What I would really like next are the real bronze windows and doors that they offer. Hmm… just need to think hard where to find money to fund this project.